Back from the dead with some recent real-life numbers.

3.2GHz, P4 Xeon, 9 SATA disk array.

3ware HW RAID5: 32Mb/s write, 159Mb/s read
Linux SW RAID5: 112Mb/s write, 138Mb/s read
Areca HW RAID5: 113Mb/s write, 365Mb/s read
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Mk2a 60GB Blue. Serial 030102962 sig.mp3: File Format not Valid.